National Library of Medicine
The world's largest medical library. It collects materials in all major areas of the health sciences and to a lesser degree in such areas as chemistry, physics, botany and zoology. http://www.nlm.nih.gov/
Sinuses.com
A comprehensive site on sinusitis, one of the most common diseases. With sections on the related topics of allergy and asthma. http://www.sinuses.com
KidsHealth
Up-to-date information on growth, food and fitness, childhood infections, immunizations, and medical conditions from the Nemours foundation. http://kidshealth.org/